The
Ogoki Reservoir was created as a water diversion to divert water
that was flowing north to James Bay, south into Lake Nipigon for
hydroelectric power generation on the Nipigon River before it enters
Lake Superior. Construction on this project was carried out in the
late 1930's and dams built on the Ogoki River and Mojikit Lake were
closed in 1942 combining the Ogoki River and 3 existing lakes into
one large body of water. The resulting reservoir is almost 35 miles
long and covers over 35,000 acres. Ice roads and winter roads that
were utilized to transport materials during construction have long
since disappeared and the only access to the area is by seaplane.

Because of its irregular shape with lots of bays and islands, there
are no large open expanses where wind and rough water pose a problem
for fishing or boating.